1. A new method to improve efficiency and to increase power of the transmitter (in Russian);Kolesnikov,1940
2. Power-tube performance in Class C amplifiers and frequency multipliers as influenced by harmonic voltage;Sarbacher;Proc IRE,1943
3. History of Class-F and inverse Class-F techniques;Grebennikov;IEEE Microw Mag,2018
4. Improving VHF transmitter efficiency by using the biharmonic mode;Glazman;Telecommun Radio Eng,1975
5. Increasing of useful power of the resonant semiconductor power amplifier by increasing its efficiency, Part II (in Russian);Berman;Radiotekhnika,1958